CREDENTIALING
UST/AST
Petroleum storage tanks are regulated by federal and state laws. Many states require that tank workers be licensed or certified before installing, retrofitting, or decommissioning UST and/or AST systems or components.

Code Council UST/AST examinations can complement state licensing programs. In some states, individuals are required to pass state-specific examinations.
The program is used as a mandatory requirement in whole or in part by some states. It is available as a voluntary credential in several other states where there is not yet a mandatory UST or AST licensing requirement.
Anyone seeking a state or local license should first contact the appropriate licensing agency regarding specific local requirements.
Most Code Council UST/AST credentials are valid for a period of two (2) years. Individuals who wish to renew their credential for an additional two-year period must do so by taking and passing the examination again.
UST/AST Exams
ICC offers National UST/AST exams as well as specific exams for Alaska, California, Michigan, New Jersey, Oregon, Puget Sound, Washington State and Wyoming.
Renewable UST Certifications
Michigan Class A & B UST System Operator Certifications (NA/NB) are now available for renewal on myICC.
Not sure if you have a myICC account? Contact us with questions.
California UST Inspector (UI) Certification has two renewal options:
- Fulfilling continuing education requirements approved by the California State Water Resources Control Board, or
- Passing the exam again.
For more information:
- Visit www.waterboards.ca.gov/ust for the requirements of the California State Water Resources Control Board
- Fill out the UI Paper Application
- Learn more about California UST Inspector Renewals
Start Your Journey
Learn everything you need to know about before, during and after the exam.

Admin Rules and Policies
Be sure to review all rules and policies before exam day.
Other Credentialing Categories
Certifications
The International Code Council offers several certification oppportunities to support career advancement.
Contractor/Trades
The International Code Council’s Contractor/Trades examination program is an independent testing program designed to provide licensing agencies with information regarding qualified contractors and trades professionals.
Questions? Contact Us
ICC Credentialing
Email: customersuccess@iccsafe.org
Phone: 1-888-ICC-SAFE (422-7233) ext. 0
Certification Policies
ICC understands the importance of impartiality in carrying out our certification activities, managing conflict of interest, and ensuring the objectivity of our certification activities.
To learn more about our certification and education policies, please read the following:
Council Policy 45, CC Rules of Procedure, Records Release, and ICC Credentialing Compliance Principles.